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difference between LD_LIBRARY_PATH and PATH

navi2582

Hello all,

Could anyone please help me undestand the functionality between LD_LIBRARY_PATH and PATH?

For example,

setenv INCISIVPATH ${INCISIVHOME}/tools/bin
setenv INCISIVLIB ${INCISIVHOME}/tools/lib

...

setenv LD_LIBRARY_PATH ${INCISIVLIB }:$LD_LIBRARY_PATH

setenv PATH ${INCISIVPATH}:$PATH

Is it interchangeable?

Thanks,

Naveen

Parents

  • Hi Naveen,

    I'm sure Google could have helped answer this, but here goes: PATH is the Unix search path for finding executables (and scripts), whereas the LD_LIBRARY_PATH is the search path for finding shared objects and dynamically linked libraries - some binaries do not have all of the code compiled into them, but instead they reference common library functions that are used by many different executables, they are shared.  Such binaries have "links" to the library functions or shared objects, but on each machine the libraries could be located in different places, so the LD_LIBRARY_PATH is used to specify where to find them.

    Hopefully what I've said here is correct, and hopefully it answers your question.

    Regards,

    Lawrence.

Reply

  • Hi Naveen,

    I'm sure Google could have helped answer this, but here goes: PATH is the Unix search path for finding executables (and scripts), whereas the LD_LIBRARY_PATH is the search path for finding shared objects and dynamically linked libraries - some binaries do not have all of the code compiled into them, but instead they reference common library functions that are used by many different executables, they are shared.  Such binaries have "links" to the library functions or shared objects, but on each machine the libraries could be located in different places, so the LD_LIBRARY_PATH is used to specify where to find them.

    Hopefully what I've said here is correct, and hopefully it answers your question.

    Regards,

    Lawrence.

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